function qiehuan(num){
		//alert(num);
		var head_ =$("#head_"+num);
		var bu = $("#bu");
		var sub_head = $("#sub_head");
		var head_content = $("#head_content_"+num);
		//alert(head_content.innerWidth(true));
		if(head_content.html()==""){
				sub_head.html(" ");
			}else{
				sub_head.html(head_content.html());
			}
		//if(head_.attr("padding")==""){
			boxX = head_.innerWidth(true);
			leftBox = 0;
			s = "";
			for(var i=1;i<num;i++){
				w = $("#head_"+i).innerWidth(true);
				//if((w % 14) < 7)w = Math.floor(w/14)*14;
				s +="_"+w;
				leftBox += (w+22.1);
			}
			//alert(s);
			if(num>1){
				floatX=leftBox;
			}else{
				floatX = 7;
			}
			//alert("_boxX:"+boxX+"_leftBox:"+leftBox+"_floatX:" +floatX);
			if(floatX<=0)floatX=0;
			
			//head_.attr("padding",floatX);
			head_.attr("w",boxX);
			bu.css({marginLeft:floatX+"px",width:$("#head_"+num).innerWidth(true)});
			
			boxX1 = head_content.innerWidth(true);
			floatX1 = floatX;
			//alert(floatX1);
			if((floatX1+boxX1)>598)floatX1=598-boxX1;
			//alert("floatX1:"+floatX1+"_boxX1:"+boxX1);
			if(floatX1<0)floatX1=0;
			
			sub_head.css({marginLeft:floatX1+"px"});
			//head_.attr("suhead",floatX1);
			
		/*}else{
			bu.css({marginLeft:head_.attr("padding")+"px",width:head_.attr("w")});
			sub_head.css({marginLeft:head_.attr("suhead")+"px"});
		}*/
	}